From 376925a2099dab0221325c6001d970ddb18c9b8e Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Mon, 24 Oct 2022 15:47:09 +0300
Subject: [PATCH] Work around msvc-14.1 /permissive- failure

---
 include/boost/variant2/variant.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/boost/variant2/variant.hpp b/include/boost/variant2/variant.hpp
index 91920de..7451eda 100644
--- a/include/boost/variant2/variant.hpp
+++ b/include/boost/variant2/variant.hpp
@@ -2448,6 +2448,11 @@ struct tag_invoke_L1
 {
     boost::json::value& v;
 
+#if defined(BOOST_MSVC) && BOOST_MSVC / 10 == 191
+    // msvc-14.1 with /permissive- needs this
+    explicit tag_invoke_L1( boost::json::value& v_ ): v( v_ ) {}
+#endif
+
     template<class T> void operator()( T const& t ) const
     {
         boost::json::value_from( t, v );